Lambda LP Series - Parallel Operation; Detailed Operating Procedures; Safety Notice; Constant Voltage Operation

This method permits operation for either constant voltage or constant current with
automatic crossover to either mode of operation whenever the respective limiting operating - ~
current or voltage is reached. Figure 7 shows connection for either local or remote
sensing.
Connections For Parallel Operation
The current capability of LP power supplies can be extended by parallel operation of
two LP power supplies of equal* voltage capacities. The two units are shown connected
for parallel operation in figures 8, 9. One power supply designated the "master" or (M) unit
controls its own output as well as the output of the second power supply, designated the
"slave" or (S) unit.
*For applications using supplies of unequal voltage ratings, consult factory for details
of operation.
Unit (S) operates to regulate its current in a ratio to that of the (M) unit by comparing
the current in its internal sampling resistor with that current sampled by the master
internal sampling resistor. When power supplies of unequal current capacities are parallel
connected, the division of current supplied will be approximately equal to the ratio of the
current ratings of the supplies.
Parallel connected units can be operated for constant voltage with local sensing, fig-
ure 8, or remote sensing, figure 9, as well as for constant current with automatic cross-
over, figure 8. When operating for constant voltage, the (M) unit can automatically cross
over into constant current operation.
DETAILED OPERATING PROCEDURES
SAFETY NOTICE
DANGEROUS VOLTAGES EXIST
IN THIS EQUIPMENT. OBSERVE
THE USUAL SAFETY PRECAUTIONS WHEN OPERATING ORSER-
VICING THE EQUIPMENT TO AVOID SHOCK OR INJURY.
Constant ~ Voltage Operation, Adjustable Current Limit
1. Remove AC power to the supply and place power ON...;OFF switch in OFF position
before connecting load to the supply.
2. Determine load requirements, select wire size from figures 1 and 2 and choose
desired type of supply-load connection from figures 3 and 4.
3. Connect supply to load as shown on the selected connection diagram.
NOTE: When shipped from the factory, the supply is ready for use as a
local-sensing constant voltage source with automatic crossover or as a
constant current source. Jumpers are connected at the factory as shown
in
figure 3. Take care to remove the appropriate jumpers for load re-
quirements that need different supply-load connections. Refer to the
appropriate connection diagram.
4. Turn OUTPUT VOLTAGE control knobs to the desired voltage setting.
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10
IM-LP400
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